Convert gigabytes to gibibytes

One gigabyte is 0.931322575 gibibytes. To convert any amount, multiply by 0.931322575. Going the other way, one gibibyte is 1.07374182 gigabytes.

Multiply the gigabyte figure by 0.931322575. So GiB = GB × 0.931322575. For a quick mental estimate, the two units are close enough that the numbers barely change — useful when you only need a rough sense of scale.

One gigabyte is about two hours of HD video. A gigabyte is one billion bytes. A drive sold as 1 TB holds 1,000 GB decimal, which your operating system may display as 931 GiB — nothing is missing, the units differ.

One gibibyte is what your OS calls a 'GB' of memory. A gibibyte is exactly 1,024³ bytes, about 7.4% more than a gigabyte. RAM is always sold in binary units even when storage is not.

Because two different definitions are in play. Storage manufacturers use decimal units — 1 TB means exactly one trillion bytes. Windows and many other systems display binary units but label them with decimal names, so they show that same drive as 931 "GB" when they mean 931 gibibytes. Nothing is missing and nothing is faulty; the drive holds exactly what it says, measured differently. The IEC standardised kibi, mebi and gibi in 1998 specifically to end this, but adoption has been patchy.

Yes — both decimal and binary prefixes are exactly defined powers, so every figure here is exact rather than approximate. The results are shown to seven significant figures; the underlying arithmetic uses full double precision.